Consider a Listener Who Is a Distance $x$ From a Loudspeaker $x / 2$

Multiple Choice

Consider a listener who is a distance $x$ from a loudspeaker. If the listener moves in so that her distance is now $x / 2$ from the loudspeaker, by what factor will the intensity of the sound increase?

A) 2
B) 3
C) 1.5
D) 4